Vacuum-tube generator system



P H. CHIREIX ,3 I

VACUUM TUBE GENERATOR SYSTBI Filed Nov. 6. 1926 1 7 1-5 IQ T q Syd/o 1: j I

INVENTOR 4 TTORNEY tlalsto f vention are'set forthwith innn nx onmnrx, or rams, FRANCE I f YACUUIYI-TUBECGENEBATOR SYSTEM Application filed llfo vember e, 192e,

The present invention relates to vacuum tubegenerator systems and more particular- 11y to oscillator arrangements adapted to extra short waves. "35' 'In my I copendingapplication, Vacuum tube generator system, Serial Number- 99,740,

'filed April 5, 1926, I have disclosedseveral circuit arrangements,which by a convenient istribution of the radio frequency potenishing the losses,

tance.

' It is an object of the present invention to provide an arrangementparticularly adapted to extra short'waves, and in which all of the V inassiveandlarge apparatus are grouped in suchfa manner that they will all be, from'a 'radiofrequency viewpoint, at practically zero potential to ground. In thisnianner, as set forth in my copending application mentioned above,-the capacitance to ground of these 7 partsdoes not interfere, whilethe circuit losses are reduced to a minimum] "The'novel features characteristic of my inparticularity in the The invention itself, however, both as to its construction and mode of operation together withthe objects'and ad- I vantages thereof will best be understood by as well as the stray capaciappended "claims.

"F30, reference to the following clescri'ptiomtaken in c'onnectionwith ing,in which g a j Figure 1 shows schematically the chief fea-. tures'of the invention,

v Figure 1A shows for obtaining longer waves,

the accompanying drawjrangement-for obtaining still shorter waves Figure 2 illustrates diagrammaticallythe arrangement of the self-inductance, I t Figure ,3 is a modifiedconstruction of the grid connection shown inF-igure 1, r v c Figure 4 shows a symmetrical arrangement that may be used employing two triodes.

Referring to the arrangement shown: in Figure 1, elements 10, 11 and '12, respectively, stand for the filament, the grid,tand the plate of the wave-' enerating triode 13. 1 and 4 2 denote, the high andlow potential sources 00 which are required forfeeding the plate 12 particularly 1 ground, allow of "considerably diminployed, although it noted sufficiently large compared with the internal a modified arrangement triple self-inductance.

Serial No. 146,620, and in France November 2 5, 1925.

and for heating the filament 10 and which are conventionally represented as a direct current generator and as a battery, respec tively, said sources having a common point that is grounded. 3 is the ammeter measuring the plate output; lis the customary stopping condenser,- 5 and 6 stand for the grid re-' sistance (leak) and the usual grid condenser adapted, to negatively polarize the grid, 7

denotes "the D. Gammeter measuring the D. C. rectified by the grid; 8 is a highfrequencyammetenwhile 9 represents the selfinductance ,unit for maintaining oscillations. This self-inductance unit up of 3windings a, b and cstrongly coupled with one another, and they are preferably given the form of helices, it being merely "or the sake of clearness ofrepre'sentation that'the same is-h'ere illustrated indeveloped f t I I Since the circuit arrangements here involved are specially intended for short-wave workpno other capacities than such internal capacities of the triode as exist between electrodes 1011,'11-12 and 10-12, are emwill be understood that a capacity 14 could be inserted as shown in ig. 1A in order to obtain longer waves. The main paths of the radio frequency cur rents are along 124-68-11-12 and along 12' 4 c s 9-,10 12; It will be that, provided condensers 4 and 6 are capacity of the tube (plus capacity 14, if de sired), the radio frequency potentials set up a across condensers 4 and 6 will be negligibly Figure 1B shows another modified ar-;--

low so that from a radio frequency viewat a potential coming'very close to that of" the ground. It will be noted, moreover, that I the'radio frequency potentialbetween' w and filament is governed by the potential fall grid 11 plus r the j drop of potential due'to magnetic stray grid along-the connection 16 to'the the three windings of the [Arrangements "are preferably so madethatthelosses (leakage): turnout to be very small by building the self-inductance unit 9 in a manner asdiagrammatically indicated in Fig; 2, which existent between is in reality made structure embodying the wires a, b and a helical coil c. -In this manner, very strong coupling is obtained between the difierent windings. Another desirable plan is to place the assembly inside a metallic cage so as to prevent it from shows in central vertical section radiating. energythrough the room where it is mounted.

. self-inductance coil It will furthermore be readily understood that the condenser 14 disclosed in Fig. 1A

could be replaced bya sel-f inductance coil 15, shown in FiglB. The, mounting of this diminishingthe wave-length. Inthis latter case, a recommendable planwould'be to eX-; tend the self-inductance coil 9 beyond the point brought to the grid .11 as indicated in, Fig. 3-, anl tobring the" end to the ammeter 8.

The part of the wi ding located above point" 16 would then represent the self-inductance V coil 1501?: Fig. 118. This scheme, among system radiates Y spectively,

other things,

far less energy on account of the fact that the fluxesin -thetwo parts of 5 the self-inductance coil 9 tend to workv in oppsi 0n-.- 1 r Fig, illustrates amodificationbfthecii cuit arrangementFigil in which the arrange' mer t ismadesymmetrical by the provision of twetriodes=13 and '13. Also this scheme comprises plate and filament sources 1 and2, rewith a common point connected with earth, stopping condenser4, gridleak ductances 9 and 9 resistance and condenser 6-, and coupled inwhich unite, respectively,

the filaments 10-an lg0'- and the gridsll 'and 11, The self induc tance coils always conunit asdisclo'sed in merits-other than the oscillation coil are pracplate and gridelectjrodes adapted 5 waves, the combination with a three-electrode 1 vacuum tube; ofan oscillation circuit comstitute but one and the s'ameself-inductance Fig; 2, and all of the eletically at ground potential from a radio fre quency viewpoint." Particularly in the case oi tubes provided with watericirculat'ionthe water supply conduit for the plates haveno radio frequency. potential. This arrangement l- -keitheone shown inFig. 1 nsures-aminimum. amount of losses, while moreover locat on of: instantaneous;- po- 7 tential points that arein opposition for the excitation oi symmetric antenna. QHaVing thus jde scribed my invention, 1

claim:

1. In a to the; generation, of very prising the intereelectrode capacity between ductance in the grid circuit, an inductance in eachiof the leads -o-f;the filament heating.

being closely coucir t, s ind nces.

pied, a filament heating source, a plate supply source,

' shuntcondenser connected between and a grid leak resistance and said. sources, the grid coupled to said would, further permit or capacity condensers,

for high frequencycurrents leak resistance.- ofiers the advantage that the" connected together and said inductances, at one termlnal,

1 the grid adapted to the generation of Very short waves, comprising a vacuum tube having the usual filament, grid and plate electrodes, an

inductancelin each ofthe filament leads, a

source ofenergy" arranged to heat the filament through said 1 one of itsterminals grounded, an inductance cnneeteu'te the grid electrode and closely,

ground, a high voltage supply source connected betweenplate and; ground, andapair of largeone shunting the plate oroviding a direct path between. plate and'ground and the other shuntingthe grid supply source and 3. In a system for" generating high he quency currents, a pair ranged vacuum tubes, the plates thereof be ing connected together and the filaments thereof fed-in parallel, an inductance inzeac'hof the leads to the filaments, a common source of energy forheating said filaments throughsaid inductances,said source being grounded.

at, one terminaha common inductance connected to both grids and coupled to said first mentioned inductances, anda common source of energy connected to bothlp'late's ot.. the tubes and also grounded at one terminal.

4:. In a system'for generating high ire quency currents, a pair of symmetrically ar ranged vacuum tubes I their filaments fed in parallel, an inductance in each of the leads to the filaments, a common sourcecf energy for heating said-filaments through said source being grounded I a common inductance con-F nected to both grids and coupled to said first mentioned v inductance's, a common.

muuctances and having first mentioned inductances, i grid leakresistance connected between the gridinductance and heating battery ofsymmetrically ar aving their anodes the tubes and also grounded at one terminal,

and a grid leak-resistance and shuntcondenser connected betweenthe md'pointof Inductance and the ground j 00111190 tionbetween the inductances in correspondv -.in=g l'eads to thefilamen s. circu t arrangement particularly 1 short t HENRI c n ma...

of said tube, an i a common ground connection for both 

